The feelgood offensive I've mentioned before has been in full effect, with David Cameron holding a cabinet meeting at the Olympic Park and Paul Deighton, the chief executive of games organisers LOCOG, warning the nation not to miss out on the festival of fabulousness that London 2012 is going to be. That's their job, and I'm happy for them. Meanwhile, it's my job - well, part of it - to mention a few feelbad factors as the countdown reaches minus 200 days.

Shortly before Christmas it was decided that Dow Chemical will have none of its corporate branding on the fabric wrap around the stadium it is sponsoring. This development was characterised by campaigners against the deal, who claim that the company has continuing liabilities arising from the 1984 Bhopal disaster, as "the first real chink in Dow Chemical's armour."

But Dow continues to insist that the issue has been dealt with and LOCOG chair Lord Coe has continued to defend the deal. So the campaigners, who include London Labour MP Barry Gardiner, have now challenged both Coe and London mayor Boris Johnson to sample the contaminated water Bhopal residents have to drink. They issued their challenge in Trafalgar Square. Here's how an Indian TV channel reported the event.

Feeling bad, yet? If not, it may help a little to know that just as responsibility for the park is passed from the Olympic Delivery Authority (ODA) to LOCOG, so the debt accrued from the purchase of the land on which the park is built has continued to passed from one Olympic-related public body to another. The complex history of this process can perhaps be most easily summarised as a series of financial "black hole" discoveries. These tend to occur every autumn. Here's a timeline.

Black Hole Number One: In September 2009 it emerged that £160 million overspend by the London Development Agency, the mayoral body responsible for purchasing the land from its array of inhabitants, had not been spotted. In City Hall, political unpleasantries ensued.

Black Hole Number Two: In October 2010 a London Assembly report identified one of £387 million (LDA) will be left owing £387, which it reckoned the LDA would end up owing the Government as a result of the arrangement to transfer the land debt to the Olympic Park Legacy Company.